The greek letter "alpha" (α) for both. If x is directly proportional to y, you could say x α y. For inversely proportional, you would say something like x α 1/y, or x α y^-1, as in, directly proportional to the inverse.
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Directly proportional relationship is F=ma, F is directly proportional to a. Inversely proportional relationship is v=r/t, v is inversely proportional to t.
Force is directly proportional to mass provided the acceleration is constant.
Directly. That's why you can't move a car by blowing on it.
Directly proportional, at pressure and temperature constant.
Disproportional.If instead you're looking for the antonym of directly proportional, that would be inversely proportional.